Charybdis (Charybdis) natatoris commonly referred to as Ridged swimming crab, wrinkled swimming crab, rock crab. Difficulty in the aquarium: Not suitable for home aquaria!. Toxicity: Toxic hazard unknown.
Charybdis (Charybdis) natator has a fan shaped carapace which is brown to orange in colour on the dorsal surface the ventral surface is bluish mottled with white and pale red spots and the legs are dark, reddish brown in colour. The carapace is densely covered with short pubescence.
Charybdis natator is found throughout the Indian and Pacific Oceans from eastern South Africa and Madagascar north to the Red Sea and across the Indian Ocean, including the Mascarene Islands and the Seychelles, to the western pacific where it extends north to Japan and south to northern Australia including Lord Howe Island.